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Composition of Borrowings (Detail) - USD ($) $ in Thousands		Jun. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Federal funds purchased		$ 0	$ 0
Securities sold under agreements to repurchase:
Securities sold under agreements to repurchase		122,158	121,742
FHLB borrowings		65,000	90,000
Subordinated debt		15,464	15,464
Other debt		535	2,535
Total borrowings		$ 203,157	$ 229,741
Federal funds purchased	[1]	0.00%	0.34%
Retail	[1]	0.11%	0.13%
Wholesale Repurchase Agreements
Securities sold under agreements to repurchase:
Weighted average contractual rate	[1]	3.71%	3.71%
FHLB Borrowings
Securities sold under agreements to repurchase:
Weighted average contractual rate	[1]	4.04%	4.07%
Retail
Securities sold under agreements to repurchase:
Securities sold under agreements to repurchase		$ 72,158	$ 71,742
Wholesale
Securities sold under agreements to repurchase:
Securities sold under agreements to repurchase		$ 50,000	$ 50,000
[1] Weighted average contractual rate

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